<li class="{% if active %}active{% endif %}">
  <a tabindex="0" role="button" data-container="body" data-toggle="popover" data-trigger="hover" data-placement="top" data-html="true" title="提问必答 {% if not active %}<small class='text-muted'>(暂未提供)</span>{% endif %}" data-content="对于提问做到有问必答，帮您扫清学习过程中的种种障碍">问</a>
</li>